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Composite Insulator

The insulator is used to support and secure the busbar and charged conductor and make sure there is enough distance and insulation between conductors or between the conductor and ground.

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Product Details


The insulator is used to support and secure the busbar and charged conductor and make sure there is enough distance and insulation between conductors or between the conductor and ground.


Insulator can guarantee enough insulation existing between the conductor and cross arm/tower. It mainly has two functions in overhead transmission lines, namely, supporting conductor and preventing electric leakage. It should be able to stand the vertical load and the horizontal tensile strength of the conductor when operating. It also stands sunshine, rain, climate changes and chemical corrosion. Therefore, the insulator requires not only good electrical properties, but also enough mechanical strength.


Consist of the insulator core rod, silicone rubber shed and end fittings. The insulator core rod is an abbreviation of epoxy resin glass fiber drawing rod, which serves as the framework of the composite insulator with several functions, such as bracing the shed, internal insulating, linking end fitting and bearing mechanical load. Its tensile strength, which can reach 600Mpa, is twice that of normal steel, 5-8 times that of ceramic materials. Good dielectric property, chemical resistant, good bending fatigue resistance, anti-creep and anti-impact. The main function of the silicone rubber shed is protecting the rod, shielding against rain and snow, increasing creep distance and external insulation. It uses macro-molecule polymer silicone rubber as the matrix, added with flame retardant, anti-aging agent, coupling agent and other fillers, then vulcanized under high temperature and high pressure. It has sound hydrophobicity and mobility as well as good corrosion resistance, aging resistance, electrical insulation and other properties. 


Composite insulators include composite pin insulator, composite cross-arm insulator, composite suspension long rod insulator, composite post insulator, composite tension insulator, windage yaw proofing composite insulator, spacer composite insulator, composite insulator for electric railway overhead contact line, etc.


1) Made of special steel and labyrinth design principle for the fitting end is adopted. It also has multi-layer protection and good sealing, solving insulator’s most critical problem -- interface electrical breakdown(puncture).

2)The core rod adopts ERC high temperature, acid-proof rod. A special coupling agent is applied to the interface of the rod and silicone rubber.

3) The shed adopts high temperature and high pressure one-step forming process, coupled with PC monitored post vulcanization, extending product working life. The product is especially applicable to heavily contaminated areas, with environment temperature ±40℃ and altitude of not more than 2000m.

If you are in need of composite insulator, welcome to buy the quality and discount products with low price from our factory. Known as one of the leading manufacturers and suppliers, we must be your best choice. Check the price list and the quotation with us now.

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